/Engine/Source/Runtime/Engine/Classes/VT/RuntimeVirtualTexture.h
Initialize the render resources. This kicks off render thread work.
void InitResource ( [IVirtualTexture](API\Runtime\RenderCore\IVirtualTexture) * InProducer, [FVTProducerDescription](API\Runtime\RenderCore\FVTProducerDescription) const & InProducerDesc )